Altlene, often called Lene for short, is a main character from the Busou Shinki franchise, appearing across various anime adaptations, light novels, manga, and video games. She is classified as a battle-type Shinki, a small but highly advanced robotic companion designed to serve and protect her human Master. Lene is specifically identified as the Altlene model, a Valkyrie-type unit, and is the twin sister of another Shinki named Altines. In several storylines, she serves a high school freshman named Masato, living with him and fellow Shinki Arnval and Altines, before being joined by a more combative unit named Strarf.

In terms of personality, Lene is often portrayed with a gentle and nurturing disposition, frequently acting as an emotional anchor and source of support for her companions. This caring nature is balanced by a strong sense of justice and a dignified, knightly demeanor, making her a figure of both compassion and principle among the Shinki. Her personality is not solely defined by gentleness, however, as she also exhibits a determined side, especially when the well-being of those she cares about is at stake. Her motivations are deeply rooted in loyalty; she is driven by a desire to serve her Master faithfully and to protect her friends and allies, embodying the qualities of a devoted companion and a fierce warrior.

Lene's role in the story is multifaceted. She is both a capable combatant and a caring companion, often providing guidance and support to other Shinki while also engaging in battles and various adventures. The narrative sometimes places her in leadership positions, where her tactical abilities and strategic thinking are put to the test. One episode, titled Lene's Underground Wars of the Empire, delves deeply into her character, exploring the psychological toll of leadership as she unites her team against internal dissent and external threats in a subterranean conflict. This episode highlights her burden of responsibility, as her decisions carry significant weight and repercussions for those who follow her. Her relationships are central to her development, particularly the bond with her twin sister Altines and the dynamic with her Master, which evolve through shared trials and moments of both intense combat and quiet reflection. Her interactions with both allies and rivals reveal her vulnerabilities and strengths, contributing to a nuanced portrayal of friendship, rivalry, and sacrifice.

Notably, Lene possesses several advanced abilities that make her formidable in combat. Her design incorporates the MMS Tall Body, which enhances her capabilities for three-dimensional strategic maneuvers. She is equipped with Reinforced Crystal Armor that houses small condensers throughout her body, including her limbs, allowing for increased power output while maintaining high mobility despite the weight of her armor. One of her most versatile features is her skirt armor, which can transform from a close-combat weapon into high-mobility wings, granting her considerable flexibility and aerial combat capabilities. This combination of protective gear, enhanced power systems, and adaptable weaponry makes her a highly effective close-quarters combatant, all while she retains the dignified and elegant presence that defines her character.